It's a good idea to do this. - If you are sometimes embarassed by your ringtone, it's almost certainly the wrong one and YOU SHOULD CHANGE it, Don't do this. It isn't allowed/permitted - You MUST NOT USE your phone in "quiet zones" on trains or in hotels. That is the reason why they exist, You don't need to do this. It isn't necessary. - Your phone is not a megaphone. You DON'T HAVE TO SHOUT., It's necessary or compulsory to do this. - If you HAVE TO KEEP your phone ON because you are expecting an important call, appologize in advance., It's necessary/compulsory to do this. - If you MUST take a call in the car, use a hands-free set.,

EF Intermediate 4B

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